/*
 * File    : LogRelation.java
 * Created : Nov 29, 2005
 * By      : TuxPaper
 *
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details ( see the LICENSE file ).
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.gudy.azureus2.core3.logging;

/**
 * @author TuxPaper
 * 
 */
public class LogRelation {
    /**
     * A short description of what your class holds that can be printed by the logger
     * 
     * @return
     */
    public String getRelationText() {
        return toString();
    }

    protected final String propogatedRelationText(Object o) {
        if (o instanceof LogRelation)
            return ((LogRelation) o).getRelationText();

        return null;
    }

    /**
     * Query this class for a reference to another class that it may hold
     * 
     * @param c
     *            Class desired
     * @return If found, the class desired. Otherwise, null.
     */
    public Object[] getQueryableInterfaces() {
        return null;
    }

    public final Object queryForClass(Class c) {
        return queryForClass(c, getQueryableInterfaces());
    }

    private boolean running = false;

    protected final Object queryForClass(Class c, Object[] queryObjects) {
        if (running || queryObjects == null)
            return null;

        try {
            running = true;

            if (c.isInstance(this))
                return this;

            // Check if any of the objects are of c
            for (int i = 0; i < queryObjects.length; i++) {
                if (c.isInstance(queryObjects[i]))
                    return queryObjects[i];
            }

            // Query each object that is LogRelation
            for (int i = 0; i < queryObjects.length; i++) {
                if (queryObjects[i] instanceof LogRelation) {
                    Object obj = ((LogRelation) queryObjects[i]).queryForClass(c, ((LogRelation) queryObjects[i]).getQueryableInterfaces());
                    if (obj != null)
                        return obj;
                }
            }

            return null;
        } finally {
            running = false;
        }
    }
}
